Pumping-jack.



No. 881,972. PATENTBDMAR.1.7, 1908..

L. R'. STONE. PUMPING JACK.

APPLICATION FILED JUNE 6. 1907 atto'bnclga W UNITED STATES PATENT OFFICE.

I LUTHER R. STONE, OF MUNDEN, KANSAS.

PUMPIN G-J A OK.

To all whom it may concern:

Be it known that I, LUTHER R. STONE, a citizen of the United States, residing at Munden, in the county of Republic and State of Kansas, have invented a new and useful Pumping-Jack, of which the following is a specification.

This invention relates to pumping jacks.

The object of the invention is to improve the manner of connecting the driving shaft and the walking beam, whereby the vibrations of the latter may be increased or diminished to meet various requirements that may arise.

With. the above and other objects in view, as will appear as the nature of the invention is better understood, the same consists, generally stated, in a pumping jack comprising a walking beam, a driven shaft, and an eccentric adjustably assembled with the shaft and connected with the walking beam.

The invention consists further in the various novel details of construction of a pumping jack, as will be hereinafter fully described and claimed.

In the accompanying drawings, forming a part of this specification, and in which like characters of reference indicate corresponding parts, Figure 1 is a view in side elevation of a portion of a pumping jack, showing'the improvements of the present invention applied thereto. Fig. 2 is a view in end elevation, partly in section, looking in the direction of the arrow on Fig. 1. Fig. 3 is a view in side elevation, partly in section, of the improved eccentric for connecting the driven shaft and the walking beam. Fig. 4 is a plan view, partly in section, showing the connection between the eccentric and the driven shaft. Fig. 5 is a view in side elevation, showing more particularly the manner in which the eccentric is clamped or secured to the driven shaft. Fig. 6 is a horizontal sectional view taken on the line 66 of Fig. 3.

Referring to the drawings, 1 designates the base of the jack, which may be of any approved construction, and which supports a' samson post 2, the upper end of which carries a walking beam 3 of the usual, or any preferred construction.

Spaced from the samson post any desired distance, and supported by the base 1, are two uprights 4 which are braced against yield- Specification of Letters Patent. Application filed June 6, 1907. Serial No. 377,616.

Patented March 17, 1908.

ing by inclined beams 5, the lower ends of which are secured in any preferred manner to the base and to the upper ends of the uprights.

Journaled in suitable bearings near the lover ends of the uprights is a shaft 6, one end of which carries a pulley 7 that is driven by a belt 8 leading to a suitable source of power, not shown, and which engages a belt tightener 9, of any preferred character, carried by one of the brace beams 5. The shaft 6 also carries a pinion 10 that meshes with a gear 11 mounted on ashaft 12 that is journaled in suitable bearings in the uprights 4. Mounted upon the intermediate portion of the shaft 12 is a block 13 that is held rigid with the shaft by a set-bolt 14. This block is disposed within a diametric guide-way 15 formed in an-eccentric 16 and extending from wall to wall thereof. The formed by four spaced arms 17, that are braced by two arms 21 right angles to those first named and integral therewith and with the eccentric. The guide arms 1720 define, in addition to the guide-way 15, two slots 22 and 23 that are disposed at right angles to the guide-way and are designed for the reception of bolts 24 that pass through the block 13 and carry clamping nuts 25, washers 26 interposed between the bolt heads and the nuts serving to accentuate the clamping action of the bolts.

The eccentric is engaged by a two-part strap 27, of the usual or any preferred construction, between which and the periphery of the eccentric are anti-friction bearings 28. One of the strap members carries a link 29 that is connected in any preferred manner with the walking beam, as clearly shown in Fig. 1.

The operation of the apparatus will be obvious it being seen that if it be desired to increase the throw or vibration of the walking beam, it will only be necessary to loosen the bolts 24, lift the strap and eccentric to cause the block to approach the periphery of the eccentric, and then retighten the bolts, the reverse of this procedure being observed when it is desired to decrease thethrow of the walking beam.

From the foregoing description it will be seen that the improvements herein, while simple in character will be found thoroughly guide-way is 18,19 and 20 extending at efficient for the purposes designed, and will result in a smooth running and readily operated pumping jack.

Having thus described the invention what is claimed is 1. A pumping jack comprising an eccentric embodying an annulus, cross arms connected with the inner walls thereof, one of which has its four faces longitudinally slotted to provide a diametric guidewayfa block mounted in the guideway, means for holding the block in fixed adjustment in the guideway, a driven shaft upon which the block is fixed, a walking beam, and a strap including a link for connecting the eccentric with the walking beam.

2. A pumping jack comprising an eccentric embodying an annulus, cross arms cona walking beam, and

neoted with the inner walls thereof, one of which has its four faces longitudinally slotted to provide a diametric guide-way and op 0- sitely alined bolt-seats, a block mountec in the guide-way, bolts passing through the block and the seats and operating to hold the former in fixed adjustmentin the guide-way, a driven shaft upon which the block is fixed, a strap including a link for connecting the eccentric with the walking beam.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

LUTHER R. STONE.

Witnesses:

F. A. MCCALL, R. V. MCKENZIE. 

